-
Push/Pop data copyingWe all know that stack pointer cheese and push/pop is faster to move data than LDIR - which in turn is slower than unrolled LDI's anyway. I rewrote …
... want to synchronise with the contended memory cycles, so as ... sp,screen+0x0020
push hl ; 4T lost to ... push hl
push de
push bc
exx
push hl
push ... de
push ... -
SE Basic Type-ins^Pete suggested creating a sticky thread for SE Basic discussion. I thought a Type-ins thread might also be useful. Up to the mods if they want to ma…
... is designed for legibility with an 8x8 or a ... ; two codes dealt with will be the X and ... /> call dwncr ; deal with nasty INK and PAPER control ... ld l, a ; stored in memory.
add hl, hl ;< ... ;
colad:
push hl ; And another useful routine ... -
Minigamecompo 2011 ??????In the Minigamecompo 2010 I received only a handfull of votings. So I started a [URL="http://minigamecompo.weebly.com/forum.html#/minigamecompo-2011…
... bytes + 25 = 4121
With BIN2REM you can create a ... the programm in the shortest memory needed. For the ZX Spectrum ... of the linenumber but not with all commands.
BIN2REM ...
ld bc,1024
push de
defb 0,0 ... -
50Hurts - Full-screen 50Hz 1-pixel scrolling on a 128K Speccy50Hurts - Full-screen 50Hz 1-pixel horizontal scrolling on a 128K Speccy. Graphics are an obvious nod to Joffa, whose games and banter were a big ins…
... tell me two things from memory:
1. There's ... it.
Mine works with four 16-pixel wide patterns ... .
I'm familiar with self-modifying code. I wrote ... Speccy scroll copies sequences of PUSH statements from a map store ... -
50Hurts - Full-screen 50Hz 1-pixel scrolling on a 128K Speccy50Hurts - Full-screen 50Hz 1-pixel horizontal scrolling on a 128K Speccy. Graphics are an obvious nod to Joffa, whose games and banter were a big ins…
... screen width is 28 bytes, with borders black-on-black
;; fill 28 bytes of screen
push_8B00:
DUP 14
push ... -
Small Machine Code Routines Which Maybe UsefulAs part of creating Flynn's Adventure in Bombland I created a lot of little routines to do all sorts of things. A lot of these I created based on inp…
... - bring in screen pixel memory start
ld h, ... store h for later
push bc ; 11t - store loop ... or e ; 4t - combine with previous plot byte
ld ... or e ; 4t - combine with previous plot byte
ld ... or e ; 4t - combine with previous plot byte
ld ... -
Windows updates pain.What a pain they are,recently i had to reinstall vista,and for security/virus reasons downloaded the all the fixes,lucky to have broadband but the do…
... * Memory is especially important - ideally I wouldn't use Windows 7 with ... 're doing something particularly memory heavy like major video ... , and Free Commander can fill the gaps very well. ... inflexible, limited, has bad memory management, and lots more technical ... -
enJine: a fast tilemap enginetile engine based on excellent work by Joffa Smifff. here you can download first tech demo. [url=http://ketmar.no-ip.org/tmp/enJine.tap]Get It Now![…
... be usable with z88dk, sorry. it needs some 'strict' memory mapping.
There is some strict memory mapping for sp1 too -- this ... that it can be used with z88dk. z88dk will allow it ... specs (such as generation of push/pop sequences from spriet data ... -
Proportional Print Routine...Hi Folks, Does anyone know of a good proportional printing routine for the ZX Spectrum? Ideally I am looking for something that prints with charact…
... the original YS code, with thanks to Battle Bunny ... /> DO_IT: PUSH HL
PUSH BC
PUSH DE
PUSH AF
memory.
JR FCHR
with the address of the seventh ... -
48k dots appear but not with CUB monitorToday I tried out an issue 3 and an Issue 2 with the CUB monitor, to my surprise they both worked flawlessly, now before when I tried them on any oth…
The LM chip cannot cause a reset or fill the screen with garbage, even if faulty.
It sounds more like faulty lower memory, but then why will it work with CUB? -
RAND USR that doesn't work in emulators and clonesEons ago, I "discovered" a strange RANDOMIZE USR. This is it: [b]RANDOMIZE USR 46578[/b] Using it on a genuine ZX Spectrum rubber key or Plus model,…
... ) is stored somehow, somewhere in memory.[/QUOTE]
Where? At ... you poke these two addresses with $FF and do the RAND ... , you have to use the memory editor utility from your emulator ... by PUSH HL. There's more places in the ROM with similar ... -
RAND USR that doesn't work in emulators and clonesEons ago, I "discovered" a strange RANDOMIZE USR. This is it: [b]RANDOMIZE USR 46578[/b] Using it on a genuine ZX Spectrum rubber key or Plus model,…
... mean push? It looks like the first thing the code does with ... AF is copy from memory to registers....not ... -
Proportional Print Routine...Hi Folks, Does anyone know of a good proportional printing routine for the ZX Spectrum? Ideally I am looking for something that prints with charact…
... next two codes dealt with will be the X< ... ; channel 2 to deal with nasty INK and
memory.
add hl, hl ... br />
colad:
push hl ; And another useful routine ... - it
push af ; calculates the relevant ... -
RAND USR that doesn't work in emulators and clonesEons ago, I "discovered" a strange RANDOMIZE USR. This is it: [b]RANDOMIZE USR 46578[/b] Using it on a genuine ZX Spectrum rubber key or Plus model,…
... mean push? It looks like the first thing the code does with ... AF is copy from memory to registers....not ... will edit my original post with the fixed code. -
RAND USR that doesn't work in emulators and clonesEons ago, I "discovered" a strange RANDOMIZE USR. This is it: [b]RANDOMIZE USR 46578[/b] Using it on a genuine ZX Spectrum rubber key or Plus model,…
... instruction inmediately following HALT is PUSH DE, so if this is ... with the initial RAM value changed so this ROM never touches memory ... stack was 4444h. [B]The PUSH DE instruction was indeed executed ... ]
The instruction following PUSH DE is LD A,B ... -
A Pointless Propotional Font demoSomething I've made the last couple of days, which is probably completely pointless, but might be a bit amusing. It's also not worthy of posting thi…
... fact):
[CODE]PUSH 3
VERB
PUSH 2
NOUN ... br /> IF
PUSH 25
MESS
PUSH 12
GOTO ... database file entirely in its memory. For the Spectrum it starts ... the graphics, and replaced it with proportional font display, a ramsave ... -
How to get a minimal splib2Hello. We are designing a new engine and stuff, coded in ASM and to be used from z88dk. I was just wondering how to get a minimal splib2 with just th…
... br /> // Similar functions that come with the library (see the header ... + 1
push ix ; save function pointer used ... if those chars are validated with sp1_Validate()
... also look at how much memory this engine (=sp1) ... -
Challenge Sprint 4x tape recorderHi, I noticed a [url="http://www.worldofspectrum.org/infoseekid.cgi?id=1000051"]Challenge Sprint[/url] on eBay, and checked out the WoS entry for it…
... it loads entirely into contended memory, which might cause a little ... listened value into memory will have to deal with the ULA timming ... was present 32 times, to fill the entire 16K space.
with the Sprint disabled, I saved ... -
writing an emulator-newbie needs helpHi, this is my first post here. I decided to write a minimalistic emulator of ZX Spectrum-no emulation of advanced peripherals, no emulation of sound…
... :
- always fill lower 16KB of my memory with ROM
- if ... -
machine code loadercan someone have a look at this loader and break down what its actually doing and also how i can stop it from executing the 2 loads of headerless blo…
... basic (i'm not familiar with Plus D system, so someone ... disk to higher address in memory and then load final code ... it's correct address and fill constant data and then run ... to fit in print buffer (with your code to put it ... -
Commodore 64 - First time trying - REVIEW & Pictures!Right, so the 2nd hand shop was selling this Commodore and accessories. So I decided to buy it, as I've never had a Commodore and this is my first ti…
... . Connecting the disk drive (with a RS232 round cable)
fill the whole screen instead ... complicated, you have to POKE memory to change colours! yaghgh!
with blue writing, and POKE 36879 ... -
BUZZSAW+ Demo No. 3Right, another demo of BUZZSAW+. [URL="http://www.joefish.co.uk/speccy/Joefish_Buzzsaw_Demo_3.tap"]Joefish_Buzzsaw_Demo_3.tap[/URL] The default con…
... banks of tones elsewhere in memory to pick from and play ... four banks (704 bytes) and fill them dynamically according to the ... the sound buffers were overlapping with my extra attribute data space ... eventually I'd saved enough memory that one of these tables ... -
writing an emulator-newbie needs helpHi, this is my first post here. I decided to write a minimalistic emulator of ZX Spectrum-no emulation of advanced peripherals, no emulation of sound…
... tell me what is wrong with my ultra-short implementation of ... -
Sys64 - bug foundI've found experimentally on real ZX Spectrum and on emulator that [URL="http://www.worldofspectrum.org/infoseekid.cgi?id=0008823"]Ron Seniscal's SYS…
... ] modification I could, with no relocation: this assures ... [CODE]
f79c dde5 PUSH IX
f79e dd2a4f5c ... of storing HL in memory statically, determines it ... [CODE]
f781 dde5 PUSH IX
f783 dd2a4f5c ... -
Z80 sound enginesI'm looking for a decent sound engine to use in a Z80 program I'm writing, but I've no idea which is the best/fastest/easiest to use. I could do wit…
... will take all the memory but will consume ~1000t ... partly) random for noise. With either, you can widen ... ) rather than re-fill the buffer each interrupt ... title screen. I'm playing with VT atm.. :)
with a less complicated tune ... -
Multi-screen mazes?Well, it's been decades since I last mucked about with speccy BASIC, so over the last couple of weeks I've been starting out as a newbie learning a b…
... a full maze map in memory or can I just build ... the player leaves a screen with the nasty, just work out ... player returns to the screen with the nasty, just place him ... may have more detail to fill in. It just so happens ... -
MCODE problem...Hi Folks, Trying to write a simple machine code program to hatch the screen. So far I have the following but even this is not working - it does not…
... /> [list]
[*]Take out the memory storage so the display address ... all times.
[*]That clashes with the outer loop counter, but ... simplifying the zero check
[*]With A no longer needed to ... zero, we can keep the fill byte in it, simplifying the ... -
FN nesting error?While playing with FN functions that call assembly, I've found something weird. Check out this code: [code]10 DEF FN f(a,b)=a+b 20 PRINT FN f(FN f(…
... /~rodriguj/fn_nested_fix.szx]SZX snapshot with patched ROM and BASIC test ... 18h routine for allocating memory.
- Push to the stack the ... -
New WIP underway - 'Dingo'.Hi, Prepare for a long post. Perhaps I can even challenge ewgf here. :razz: Anyway, I've been meaning to get into Z80 programming and making a game…
... [/I]low on memory).
...just to fill out that empty line ... been tarted up a bit with some extra color.
The plan I've made with Mark is to end development ...
